A carrier including a resin layer including at least one kind of particles, wherein the at least one kind of the particles are particles of barium sulfate, wherein an amount of Ba detected is 0.3 atomic % or greater in a Ba analysis through X-ray photo-electron spectroscopy (XPS) of the carrier, and wherein circle-equivalent diameters of the particles of the barium sulfate are 400 nm or greater but 900 nm or smaller.

A carrier is provided. The carrier includes a magnetic core particle and a resin layer coating a surface of the magnetic core particle. The resin layer includes a resin, a conductive particle including tungsten tin oxide, and a chargeable filler.

A two-component developer includes a toner and a carrier. The toner is a positively chargeable toner that is positively charged by friction with the carrier. The toner includes a plurality of toner particles each including a toner mother particle and a plurality of first resin particles. An anionic surfactant having higher negative chargeability than the first resin particles is present on surfaces of the first resin particles. The carrier includes a plurality of carrier particles each including a carrier mother particle and a plurality of second resin particles. A cationic surfactant having higher positive chargeability than the second resin particles is present on surfaces of the second resin particles. The first resin particles have a zeta potential lower than 0 mV at a pH of 5. The second resin particles have a zeta potential higher than 0 mV at a pH of 5.

A carrier for two-component developer includes a magnetic particle and a resin coating layer that covers the magnetic particle and contains a resin, wherein a weight average molecular weight of the resin contained in the resin coating layer is from 1,800,000 to 5,000,000.

A carrier is provided. The carrier includes a magnetic core particle and a resin layer coating a surface of the magnetic core particle. The resin layer includes a resin, a conductive particle including tungsten tin oxide, and a chargeable filler.

A toner including toner particles and an external additive adherent to a surface of the toner particles has the following configuration. The toner particles contain an amorphous polyester resin, a crystalline polyester resin, a release agent, and a first fatty acid metal salt. The first fatty acid metal salt includes a trivalent or higher metal ion. The first fatty acid metal salt in the toner particles has an average dispersion size of 50 nm or more and 500 nm or less. The external additive contains a second fatty acid metal salt.